Todd Bishop pointed these out on his blog. He doesn't seem overly excited about the tactic to promote the Collections feature on Live Search Maps but I quite like them. Interesting that they don't seem to have any branding on which is a smart and unusual move for us. The in store window ads have a link to thepushpinproject.com - you can create your own Collection from this site but the cool part about sharing back is well hidden. Drop an email to email@example.com
I've created a Blue Monster sightings Collection.